[Render] Howto avoid black rect outside of the drawable when compositing?

[Clemens Eisserer]

Ho Owen,

> (Pixman of course, does fetch transparent, - it's just that a
> transparent source gives you black for operator=Src and an opaque
> target.)
Thanks a lot for the description, I've another bug when using SRC that
suffers from that and did not relly know where it came from.
This explains it of course :)

Thanks, Clemens